Early Ultraviolet Observations of Type IIn Supernovae Constrain the Asphericity of Their Circumstellar Material

Soumagnac, Maayane T.; Ofek, Eran O.; Liang, Jingyi; Gal-yam, Avishay; Nugent, Peter; Yang, Yi; Cenko, S. Bradley; Sollerman, Jesper; Perley, Daniel A.; Andreoni, Igor; Barbarino, Cristina; Burdge, Kevin B.; Bruch, Rachel J.; De, Kishalay; Dugas, Alison; Fremling, Christoffer; Graham, Melissa L.; Hankins, Matthew J.; Strotjohann, Nora Linn; Moran, Shane; Neill, James D.; Schulze, Steve; Shupe, David L.; Sipőcz, Brigitta M.; Taggart, Kirsty; Tartaglia, Leonardo; Walters, Richard; Yan, Lin; Yao, Yuhan; Yaron, Ofer; Bellm, Eric C.; Cannella, Chris; Dekany, Richard; Duev, Dmitry A.; Feeney, Michael; Frederick, Sara; Graham, Matthew J.; Laher, Russ R.; Masci, Frank J.; Kasliwal, Mansi M.; Kowalski, Marek; Kupfer, Thomas; Miller, Adam A.; Rigault, Mickael; Rusholme, Ben

doi:10.3847/1538-4357/ab94be

Title: Early Ultraviolet Observations of Type IIn Supernovae Constrain the Asphericity of Their Circumstellar Material

Journal Article · Tue Aug 11 00:00:00 EDT 2020 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/ab94be· OSTI ID:1783128

;

; Liang, Jingyi;

;

; Yang, Yi;

;

; Barbarino, Cristina;

;

; Dugas, Alison;

;

; Moran, Shane more »

Here we present a survey of the early evolution of 12 Type IIn supernovae (SNe IIn) at ultraviolet and visible light wavelengths. We use this survey to constrain the geometry of the circumstellar material (CSM) surrounding SN IIn explosions, which may shed light on their progenitor diversity. In order to distinguish between aspherical and spherical CSM, we estimate the blackbody radius temporal evolution of the SNe IIn of our sample, following the method introduced by Soumagnac et al. We find that higher-luminosity objects tend to show evidence for aspherical CSM. Depending on whether this correlation is due to physical reasons or to some selection bias, we derive a lower limit between 35% and 66% for the fraction of SNe IIn showing evidence for aspherical CSM. This result suggests that asphericity of the CSM surrounding SNe IIn is common - consistent with data from resolved images of stars undergoing considerable mass loss. It should be taken into account for more realistic modeling of these events.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: The ZTF Collaboration

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1783128

Journal Information:: The Astrophysical Journal (Online), Vol. 899, Issue 1; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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